Description · from the CVE record
In the Linux kernel, the following vulnerability has been resolved:
phonet: pep: fix use-after-free in pep_get_sb()
pep_get_sb() doesn't consider that pskb_may_pull() might have relocated
the skb data, and continue to access the older pointer, causing UAF.
Reproduced under KASAN:
BUG: KASAN: slab-use-after-free in pep_get_sb+0x234/0x3b0
Read of size 1 at addr ff11000105510f50 by task repro/157
pep_get_sb+0x234/0x3b0
pipe_handler_do_rcv+0x5f7/0xa10
pep_do_rcv+0x203/0x410
__sk_receive_skb+0x471/0x4a0
phonet_rcv+0x5b3/0x6c0
__netif_receive_skb+0xcc/0x1d0
Refetch the header with skb_header_pointer() after pskb_may_pull(), so
the possibly stale pointer is no longer dereferenced. There are better
ways to solve this, but, this is the less instrusive one.
Affected
ProductAffectedFixed inSource
Linux9641458d3ec42def729fde64669abf07f3220cd5 – < c4a52cb4da8d57d060b1d52085d25147a238dac2c4a52cb4da8d57d060b1d52085d25147a238dac2CNA
Linux9641458d3ec42def729fde64669abf07f3220cd5 – < df198743859fefba2f824115f8151dd62d7ad6d8df198743859fefba2f824115f8151dd62d7ad6d8CNA
Linux9641458d3ec42def729fde64669abf07f3220cd5 – < 1d81e19fc57a5ee55b4497d01bc0510d76fb95781d81e19fc57a5ee55b4497d01bc0510d76fb9578CNA
Linux9641458d3ec42def729fde64669abf07f3220cd5 – < 8d931a75a38b9bb584a4071f5ebbd52755fc35ee8d931a75a38b9bb584a4071f5ebbd52755fc35eeCNA
Linux9641458d3ec42def729fde64669abf07f3220cd5 – < 17f78c0c0d41d738ee236eb6e841e3939518805417f78c0c0d41d738ee236eb6e841e39395188054CNA
Linux9641458d3ec42def729fde64669abf07f3220cd5 – < a48a889b60f73edb0399a8b08284a2ab0bd0295fa48a889b60f73edb0399a8b08284a2ab0bd0295fCNA
Linux9641458d3ec42def729fde64669abf07f3220cd5 – < 25e3641beb51333bfbb155af2fd2573a61113af225e3641beb51333bfbb155af2fd2573a61113af2CNA
Linux9641458d3ec42def729fde64669abf07f3220cd5 – < 0f71f852a96af9685858ce59fda34ecbf85c283d0f71f852a96af9685858ce59fda34ecbf85c283dCNA
Linux2.6.28–CNA
by Kastro